Standing lap seam roofing



Mamh M, w3?, G. D. ovERHoLTz STANDING LAP sEAM RooFING vFiled oct. 5; 195e STANDNG LAP SEAM R006 George l). ilverholtz, '.liiln, Ohio, assignor to The Tiilin Art Metal Company, '.li, Ohio, a corporation of Ollio Application Uctober 5, 1936, Serial No. 104,072

6 Claims.

This invention relates to sheet metal roofing, and particularly to such roong employing joints of the standing lap seam type.

The object of the invention is the provision of an improved roong joint of this character, which is easily applied, and when laid is highly efiicient in preventing leakage between the lapping members of the joint.

A further object of the invention is the pro- 10 vision in a roofing joint of this character of means whereby a relative movement of the lapping members of the joint takes place when nailing the members to a roof, and eiects an expansion of certain/parts of thejoint against others and a consequent nrm closing of seams to exclude moisture therefrom.

The invention is fully described in the following specification, and one embodiment thereof illustrated in the accompanying drawing, in

WhiChy Figure 1 is a fragmentary perspective view of a roong embodying and laid in accordance with my invention; Fig. 2 is an enlarged cross-section of the lapping portions of two roofing sheets with such portions in the relationship they assume before nailing, and Fig. 3 is a similar view show- A ingthe relationship of the lapped joint portions after nailing.

Referring to the drawing, l, I designate roofing sheets of duplicate form. and having side edge portions lapping and cooperating to form joints, as well understood in the art, and in which joints the present invention resides. y

Each roong sheet I is formed along and parallel to one side edge, which may be termed its lapped edge, with an upstanding ridge 2 of inverted U or channel form in cross-section with its crown or leg connecting portion 3 preferably but not necessarily substantially ilat, and with its legs 4l slightly divergent or inclined to provide a broader space at the bottom than at the top. 'I'hisglattei',`however-, is not necessary. The sheet at the inner side of the ridge 2, that is, at the side towards the center of the sheet, is formed with a relatively shallow upstanding ridge 5, in the present instance of half circle form in cross-section, such ridge being parallel to and spaced 4a short distance from the major ridge 2. The free edge of the sheet at the outer side of the ridge 2 terminates in a curved upwardly and outwardly extending ange 6, which is complemental to and adapted to fit into the curved wall channel of an adjacent ridge of a lapping sheet, as hereinafter described, and which ridge is similar to the ridge 5. The legs of the ridge 2 are separated from the (Cl. 10S-18) respective ridge 5 and flange 6 by nat sheet portions I and 8, respectively.

The opposite or lapping side edge portion of each sheet is formed' along :such edge with an upstanding ridge lIl of inverted channel form 5 with its upper portion fashioned to receive and fit down closely over the upper end portion of a lapped ridge 2 of an adjoining sheet. AThe legs Il of the ridge III) incline outwardly relative to the lapped ridge 2 to. near their lower ends, so 10 that the bottom or open side portion of the ridge I0 is considerably wider than the corresponding portion of the ridge 2. The inner and outer legs Il terminate respectively in outwardly angled foot portions I2 and I3, which are of rather slight 15 inclination relative to a horizontal, so that normally the lower ends of the leg portions lI are spaced'from the respective portions i and 8 of an adjoining sheet which they lap when the outer or toe ends of said foot portions are resting on- 20 the parts 'l and 8. The ridge I0 is normally of such height relative to the ridge 2 that its crown portion is spaced a short distance above the crown portion of the ridge 2 when the ridge lll is in said normal lapping position as shown in 25 Fig. 2.

The span of the ridge portions I2, I3, or the, length of the space between the outer edges of said portions, is normally slightly less than the space between the adjacent base portions of a 30 ridge 5 and ange 6 of a lapped'sheet, so that a slight outward expanding movement of the legs i of the ridge I0 is necessary to place the toe ends of the foot portions l2 and I3 into abutting engagement with the registering base portions of 35 the ridge 5 and ilange 6. This expanding action and consequent engagement oi the outer edge portions of the foot sections I2, I3- withthe -ridge 5 and flange 6 is eiected by a forcing of the crown portion of the ridge I0 downy onto the 4o crown portion of the 'lapped ridge 2T anda consequent shortening of the space between the ends of the leg portions I I and registering at portions 1 and 8 of the lapped sheet. When this action takes place, the foot portions I2 and-'I3 spring 45 down into substantially, or near, parallel relation to the flat portions 1 and 8 of the lapped sheet. The nails I4 by which the roong sheets are secured to a roong are driven into the roof boards 5o through the crown portions of the lapped ridge members 2 and Il), and it is the driving home of these nails that draws the ridge I0 down into close engagement with the lapped ridge 2 and effects an outward expansion of the leg portions of the 55 Cil ridge I into binding engagement with the members 5 and 6 of the lapped sheet.

The foot portion I3, which is disposed at the inner side of the ridge I0 with respect to the center of the sheet, terminates in a relatively shallow ridge I5 which parallels the ridge I0 and is of a curved form in cross-section substantially complemental to the curvature of the flange 6 of a lapped sheet edge which is intended to t up into such ridge, as shown. The ridges 5 and l5 are of substantially the same shape and size to give the roofing a uniform appearance at each side of a joint.

This joint structure also forms air chambersV between the adjacent leg portions of the lapped ridge members 2 and l0, and the trough-like portions at each side of the ridge 2 provide for the eicient drainage of any water from the joint which might by any possibility pass between the seams at the lapping edge portions of the ridges.

I wish it understood that my invention is not limited to any specific construction, arrangement or form of the parts, as it is capable of numerous modifications and changes without departing from the spirit of the claims.

Having thus described my invention, what I claim as new, and desire to secure by United States Letters Patent, is:

1. A lapped joint for roofing sheets, comprising a lapped member having an upstanding ridge and shoulder portions spaced from opposite sides thereof, and a lapping member having an lupstanding inverted channel form of ridge with yieldable divergent leg portions and receiving said lapped ridge, said lapping ridge having its crown normally spaced above the lapped ridge crown and its legs normally contacting the lapped member in inwardly spaced relation to said respective shoulder portions and expansible outwardly thereagainst by a downward forcing of the crown portion of one ridge toward the other as by nailing therethrough.

leg portions at the inner sides of said shouldersf the lower ends of which leg portions contact with the lower member and are forced outward thereby into contact with said shouldered portions when the upper ridge is forced home on the lower ridge.

3. A lapped joint for roofing sheets, comprising lapping upper and lower members having interengaging upstanding ridge portions of inverted channel form, the lower member having shoulder portions spaced from and at opposite sides of its said ridge, said upper ridge having yieldabl divergent leg portions, the lower ends of whicontact with the lower member at the inner sides of said shoulder portions when the outer ridge is disposed over the lower ridge with the crowns thereof in predetermined spaced relation, said contact causing an outward spreading of said legs into abutting coaction with the respective shoulder portions when the crown portions of the spreadable divergent leg portions terminating in outwardly angled feet which normally bear at their outer edge portions against the lower member in inwardly spaced relation to said shoulders when the upper ridge has its crown portion spaced a predetermined distance above the crown portion of the lower ridge,l said leg portions being forced outward to cause the feet portion to bear against said shoulder portion when the crown portion of the upper ridge is forced downward a further predetermined extent on the lower ridge.

5. A lapped joint for roofing sheets, comprising lapping upper and lower members having interengaging upstanding ridge portions of inverted channel form, the lower member having an upwardly and outwardly extending shoulder portion at each side of its ridge in spaced relation thereto, said upper member having divergent spreadable leg portions for coaction with the lower member intermediate its ridge and respective shoulders whereby a forcing home of the upper ridge on the lower ridge will cause an outward spreading of the upper ridge legs into abutting relation to said shoulders, said upper member at the inner side of its ridge with respect to the member center having a shallow inverted channel portion which receives the respective shoulder portion of the lower member.

6. A lapped joint for roofing sheets, comprising a lapped member having an upstanding ridge and upstanding shoulder portions spaced from opposite sides of the ridge, and a lapping member having an upstanding inverted channel form of ridge with springable divergent leg portions terminating in outwardly divergent feet normally inclined to the plane of the members and adapted to contact the lower member inwardly from the inner sides of the respective shoulders when the crown portion of the lapping ridge is spaced upwardly a predetermined extent from that of the lower ridge, said feet being flattened toward the lower member and forced outward' against the respective shoulders when the lapping ridge is forced a further predetermined extent down over the lapped ridge, as by nailing through said crown portions, said lapping member having at one side of its ridge a minor ridge portion of inverted channel form which receives the respective shoulder portion of the lower member.

GEORGE D. OVRHOL'IZ. 

